Band-saw machine



@ E. mm/us ET AL.

BAND sAw MACHINE 'Filed June ,'50, 1921 2 Sheets-Sheet 2 Il l ITI raamtJen. ze, 1924.

1,482,013 PATENT OFFICE.

E. JARVIB, 0F EAST ORANGE, AND LEONARD C. LOTZ, 0F NEWARK, NEW

JERSEY.

BAND-SAW MACHINE Application tiled .Tune 30, 1921. Serial No. 461,531.

To all whom t may concern:

Be it known that. we, BENJAMIN E. JARVIS andLEoNARD C. Lo'rz, citizensof the United States, residing at East Grange and Newark, in the countyof Essex and State of New Jersey, have invented certain new and usefulImprovements in Band-Saw Machines; and we do hereby declare thefollowing to be a full, clear, and exact description .of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawin s,and to characters of reference marked t ereon, which form a part of thisspecification.

The herein-described invention relates, generally, to power transmissionmechanism; and the invention has reference, more particularly, to animproved construction of electric motor driven ower transmission.

The invention has or its principal object to provide a transmissionmechanism in combination with a self-contained power element in the formof an electric motor, the latter bein mounted in connection with thesupporting frame or base of a machine so as to be protected againstdirt, and the same being arranged in a novel relation to the powertransmission mechanism of the machine.

Other objects of the invention, not at this time more particularlyenumerated, will be clearly understood from the following detaileddescription of the same.

With the various objects of this invention in view, the same consists,primarily, in the novel construction of transmission mechanism machinehereinafter -set forth; and,- the invention consists, furthermore, inthe novel arrangements and combinations of the various devices andparts, as well as in the details of the construction of the same all ofwhich will be hereinafter more fully described, and then finallyembodied in the claims appended hereto.

The invention is clearly illustrated in the accompanying drawings, inwhich Figure 1 is a front elevation of a band-saw machine having powertransmission means made according to and embodying the principles ofthis invention; Figure 2 is a vertical longitudinal section, taken online 2 2 in said Figure l` the motor being shown in elevation: Figure 3isn transverse vertical longitudinal section, taken on line 3 3 -in saidFigure 2, the motor being shown in elevation; and Figure 4 is a detailvertical lonitudinal section, taken on line 4-4 in said 1 re 1.

imilar characters of reference arev einployed 1n all of the hhereinabovedescribed views to indlcate corresponding parts.

Referring now to said drawings, the reference character 1 indicates aframe or base having suitable supporting-legs 2. Said frame or base 1 isprovided at its front portion and at one side thereof with an upwardlyextending post 3 which terminates in a transversely disposed overhangingbracket or carrier arm 4 spaced above sald frame or base 1. Connectedwith said frame or base 1 are bearing portions 5 and 6, which arelongitudinally alined, and in which is journaled a longitudinal mainshaft 7 which extends beneath said frame or base 1.

Fixed on the forwardly projecting end of said main shaft 7, so as to bedisposed at the front of said frame or base 1 is a driver band wheel orsaw drum 8.

Secured to said overhanging bracket or carrier arm 4, so as to pro'ectupwardly therefrom, are a pairof parallel guide rods or posts 9.Slidable upon said guide-rods or posts 9, so as to be verticalladjustable thereon, is a movable cross-hea 10, having intermediate itsends a pair of perforate ears or lugs'll which support a transversefulcrum p1n 12. Mounted upon said fulcrum pin, between said ears or lugs11, is a tiltinglock 13, to which is fixed a forwardly projectingjournal stud 14, which is positioned vertically opposite said main shaft7. Connected with the rear end of said tilting-block 13 is an upwardlyprojecting lug 15 which receives the threaded engagement of an adjustingscrew 16 which bears against the rear side of said movable cross-head10. Secured to the upper free ends of said guiderods or posts 9 is afixed cross-head 17 having a central vertical perforation. Fixed to saidmovable cross-head 10 is an upwardly extending screw-shank 18, whichprojects j through said perforation of said fixed crosshead 17. A nutmember 19 is engaged upon the free end of said .screw-shank 18, the samebearing upon said fixed cross-head 17 when operated to adjust theelevation of said movable cross-head 10 upon the guiderods or posts 9.

Mounted upon said journal stud 14 for free rotation thereon is an idlerband wheel flange 23 to which 1s secured the supporting fin 24 of a.saw-table 25. Said saw-table 25 'possesses a slot 26 through which thebandsaw runs.

Supported from said flange 23. in a suitable manner so as to be disposedbeneath said saw-table is a second saw guide device 27.

The reference character 28 indicates an electric motor, to the casing ofwhich is secured, by bolts 29, or in any other suitable manner, a pivotknuckle 30. Integrally formed in connection' with the under side of saidframe or base 1 in a suitable location are longitudinally alined fixedknuckles 31 and 32, between which is inserted the pivot knuckle 30 ofsaid motor 28. A pivot pin 33 is inserted through the knuckle 31 and thepivot knuckle 30, said pivot pin having a threaded extension 34 ofreduced diameter which screws into said knuckle 32 to retain said pivotpin against accidental displacement. By the above described means saidmotor 28 is pivotally suspended so as to swing toward and awav from saidmain shaft 7, the armature shaft of the motor being parallel to saidmain shaft. Fixed on said motor armature shaft 35 is a. driving pulley36, and fixed on said main shaft 7 is a driven pulley 37. Running oversaid pulleys 36 and 37 is a driving belt 38. Secured to the sideof saidmotor 28, by screws 39 or any other suitable fastening means, is asocket-plate'40 having a socket or seat 41 adapted to receive apresser-foot 42. Said presser foot 42 possesses a shank-portion 43provided with an internally screwthreaded opening 44.y Threaded intosaid opening 44 is the end of an adjusting screw 45 which extendstransversely toward the side wall of said frame or base 1. Support-- edin said side wall of said frame or base 1. in an opening 46 providedtherefor` is a bushing 47 having a fiange 48 which engages the innerside. of said rear wall to prevent outward displacement ot said bushing.Said adjusting screw 45 is provided at its outer end with a reducedextension 49 providing a shoulder 50 which thrusts against the inner endof said bushing. The tree end ot said extension 49 projects exteriorlyof said frame or base 1. and fixed upon its outwardly projecting freeend is a finger-piece 51.

Electric circuit wires 52 tor supplying current to said motor 28 enterbeneath said Jframe or base 1, and are electrically connected with aswitch-device 53 fixed in connection with said post 3, and thence withsaid motor, whereby a convenient control means is furnished for startingand stopping said motor 28.

From the above description it will be apparent that the novel pivotalsuspension of the'motor 28, permits the same to be swung away from ortoward the main shaft 7, thereby permitting the driving belt 38 runningover the ulleys 36 and 37 to be quickly tightened or oosened as occasionmay demand, thus providing a very convenient, compact and noveladjustable combined power unit and driving means for the main shaft ofthe band-saw machine. The operation of adjusting the motor position forthe purposes above mentioned, 1s accomplished.

by turning the finger-piece 51 to rotate the adjusting screw 45.Rotation of the adjusting screw 45 in one direction, causes theshank-portion 43 ride outwardly on the threads of said adjusting screw,thereby forcing the presserfoot 42 toward the motor 28, whereby the ofthe presser-foot 42 to latter is swung away from the main shaft 7 andheld in the position to which it is thus moved, so that slack of thebelt 38 is taken up by the movement of the motor pulley 36 away from thepulley 37. If the driving belt 38 is too tight, it may be slackened byrotating the adjusting screw 45 in the opposite direction, which causesthe shank portion 43 of the pressenfoot 42 to ride inwardly on thethreads of said screw, whereby the presser-foot is withdrawn from themotor 28, allowing the latter to swing toward the main shaft 7, andconsequently moving the motor pulley 36 toward the main shaft pulley 37,and thus slackening the driving belt running over said pulleys.

Since the motor 28 is suspended beneath the frame or base 1 it iscovered and protected by the latter from dirt, saw-dust and refuse fromthe sawing operations.

We are aware that some changes may be made in the arrangements andcombinations ot the various devices and parts. as well as in the detailsof the construction of the same, without departing from the scope of ourinvention, as set forth in the foregoing speciication, and as defined inthe appended claims. Hence, we do not limit our invention to the exactarrangements and combinations of the several devices and parts asdescribed in said specification, nor do we confine ourselves to theexact details of the construction of said parts as illustrated in theaccompanying drawings.

We claim 1. The combination with a base of an electric motor pivotallysuspended beneath and covered by said base, a driving pulley on saidmotor, a main shaft journaled in said base, a driven pulley on saidshaft, a driv ing belt running oversaid pulleys, a presser foot engagingt e side of said motor toward said drlven pulley, an internally threadedshank on. said presser foot, an adjusting screw threaded into saidshank, means for rotatably journaling said adjusting screw on said base,and said ad'usting screw having an external end provlded with a fingerpiece for manipulating the same.

. belt, comprising a presser foot en aged wit the side of said motortowardlsai transmission mechanism, an adyustmg screw 1n threadedengagement with said presser foot,

a thrust bearing connected with said base for rotatably journaling saidadjustin screw, and a finger-piece fixed onsaid a screw for rotating thesame.

justing 3. base, a transmission mechanism mounted in said base, anelectric motor pivotally sup orted from said base, said motor havin arivin pulley, a drivin belt o crate by said riving pulley to rive saidtransmission mechanism, and means for moving said motor relative to saidtransmission mechanism to tighten said driving belt, comprising asocket-plate fixed to the side of said motor toward said transmissionmechanism, a presser foot engaged in said socket plate, said presserfoot having at its outer end an internally threaded shank, an adjustingscrew threaded into said shank, the outer end of said adjusting screwhaving a reduced extension forming with said screw a thrust shoulder, athrust bearing in the wall of -said base in which said extension isjournaled so that its free end projects beyond said base, and afinger-piece fixed to the free end of said extension.'

In testimony that we claim the invention set forth above we havehereunto set our hands this 24th da of Ma 1921.

- BE JAMI E. JARVIS.

LEONARD C. LOTZ. Witnesses: GEORGE D. Rlonnos, l Eva E. Dirson.

